visualbasic lecture3.pdf

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Copyright 2011 Pearson Addison-Wesley

Addison Wesley

is an imprint of

2011 Pearson Addison-Wesley. All rights reserved.

Chapter 2

Creating Applications with

Visual Basic


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Addison Wesley

is an imprint of


Section 2.1

Focus on problem Solving: Building the

Directions Application

In this section ou create our !irst Visual

Basic application:

a window that displas a map and road

directions to a hotel. In the

rocess ou learn how to lace controls on


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"e!ine #hat the Application is $o

"o %urpose: "ispla a map to the &ighlander&otel

Input: 'one %rocess: "ispla a !orm

(utput: "ispla on the !orm a graphic image

showing a map

Chapter 2 ) Slide *


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Visuali+e the Application and "esign Its

,ser Inter!ace

Below is a s-etch o! the applications !orm

Chapter 2 ) Slide /


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"e!ine 6elevant %ropert Values !or 7ach

Control

Form

'ame: Form1

$e4t: 3"irections3 abel

'ame: abel1

$e4t: 3"irections to the &ighlander &otel3

$e4tAlign: 8iddleCenter

Font: 8icroso!t sans seri!9 bold9 1 point Chapter 2 ) Slide <


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Create the Forms and (ther Controls ,sing

Visual Basic

7stablish the Form and set its $e4t propert

Add a abel control

%osition and resi+e it on the !orm

Set $e4t9 $e4tAlign9 and Font properties

Add a %ictureBo4 control

%osition and resi+e it on the !orm

Set Image propert to displa &otel8ap.;pg

6un the application Chapter 2 ) Slide =


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"esign 8ode9 6un 8ode9 and Brea- 8ode

Visual Basic has three modes in which it

operates:

"esign 8ode

the mode in which ou create the application

also -nown as design time

6un 8ode e4ecutes the application in the Visual Studio

environment

also -nown as run time

Chapter 2 ) Slide


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%ro;ect (rgani+ation (n "is-

,ser creates a new pro;ect in Visual Studio

A solution and a !older are created at the same

time with the same name as the pro;ect

$he pro;ect belongs to the solution

8ultiple pro;ects can be included in a solution

$he !older stores !iles related to the pro;ectincluding:

A solution !ile 0.sln

A pro;ect !ile 0.vbpro; Chapter 2 ) Slide >


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(pening an 74isting %ro;ect

,se 6ecent %ro;ects list on Start %age

%rovided it hasnt been moved or deleted

,se (pen %ro;ect button on Start %age $hen browse using (pen %ro;ect dialog bo4

,se (pen %ro;ect option on File menu

$hen browse using (pen %ro;ect dialog bo4

Chapter 2 ) Slide1?


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%roperties #indow

,sed to view and modi! the propert values

o! a given ob;ect

$wo views o! the properties are available: Alphabetic 0across all properties

Categori+ed 0groups properties b logical use

Chapter 2 ) Slide11


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Addison Wesley

is an imprint of


Section 2.2

Focus on problem Solving:6esponding to 7vents

An application responds to events9 such as

mouse clic-s and -eboard input9 b e4ecuting code -nown

as event handlers.

In this section9 ou write event handlers !or


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8odi! the DirectionsApplication

$he &ighlander &otel manager would li-e ou to add

the !ollowing items to the application:

A abel containing the written directions

A Button to displa the directions

A Button to e4it the application

Chapter 2 ) Slide1*


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Controls to be Added

Control Type Control Name Description

abel lbl"irections "isplas written directions

to the hotel

Button btn"ispla"irections #hen clic-ed9 causeslbl"ispla"irections te4t

to appear on the !orm

Button btn74it Stops the application

when clic-ed

Chapter 2 ) Slide1/


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$he Code #indow

"ouble)clic-ing a control in design mode:

opens the code window

creates a code template !or the controls eventhandler where ou !ill in the code !or the event

Chapter 2 ) Slide1

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